package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MemberSignature;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
	/*切入点*/
	@Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
	
	public void autoFillPointCut(){	}
/*
		前置通知，在通知中进行公共字段的赋值
*/
		@Before("autoFillPointCut()")
		public void autoFill(JoinPoint joinPoint){
			log.info("开始进行公共字段自动填充......");
			//获取到当前被拦截的方法上的数据库操作类型
			MethodSignature signature = (MethodSignature)joinPoint.getSignature();//方法签名对象
			AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解对象
			OperationType operationType = autoFill.value();//获取到数据库操作类型
			//获取到当前被拦截的方法的参数---实体对象
			Object[] args = joinPoint.getArgs();
			if(args == null && args.length == 0){
				return;
			}
			Object entity = args[0];
			
			//准备赋值的数据
			LocalDateTime now=LocalDateTime.now();
			Long currentId = BaseContext.getCurrentId();
			if(operationType==OperationType.INSERT){
				//为四个公共字段赋值
				try {
						Method setCreateTime=entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
						Method setCCreateUser=entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
						Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
						Method setUpdateUser =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
						setCreateTime.invoke(entity,now);
						setCCreateUser.invoke(entity,currentId);
						setUpdateTime.invoke(entity,now);
						setUpdateUser.invoke(entity,currentId);
						//通过反射为对象属性赋值
						setCreateTime.invoke(entity,now);
				} catch (Exception e) {
					e.printStackTrace();
				}
				
			} else if (operationType==OperationType.UPDATE) {
				//为两个公共字段赋值
				try {
					Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
					Method setUpdateUser =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
					setUpdateTime.invoke(entity,now);
					setUpdateUser.invoke(entity,currentId);
					//通过反射为对象属性赋值
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
			
		}
 
}
